Hyperlinks Problem and some more. need help

hi,
for some reason, don’t know why.. i can’t make new posts/pages with hyperlinks… i can’t get a preview, it just loads on forever. i can create a post without hyperlinks.
i tryed editing one of my widget (a text one with hyperlinks in it) and the dashborad wouldn’t save.
My wordpress is 2.7.1 (heb) i’m with Firefox 3, on windows XP sp2, and the same problem is with IE7.
i tryed to shutdown all of my plugins, but it didn’t help…
can anyone help me?